Lock



FIG. 1 is a bottom, front, and left side perspective view of a lock showing my new design, the broken-line disclosure being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is an enlarged front elevational view thereof;

FIG. 3 is an enlarged left side elevational view thereof, the right side being a mirror image of that shown;

FIG. 4 is an enlarged rear elevational view thereof;

FIG. 5 is an enlarged top plan view thereof;

FIG. 6 is an enlarged bottom plan view thereof; and,

FIG. 7 is an enlarged front elevational view thereof, with the bolt portion shown rotated to an alternate position. 

The ornamental design for a lock, as shown and described. 